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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9586570c14f4a22cfccee99875067d8896d551bc8ed52647e376dc7cea6537d8' 
  AND token = 'EAWKhIzsY8mJGk4ZBxmTOAC2uv7i0frH0Yz8hGDofCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}