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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea25c1d8da93258fcba9e19cc5f7c9278a2a8de2e1731f233934481b968dcdba' 
  AND token = '0be692bN3DxpU9Nf6Zh2gABp4/lyYZ1vMcX5LwD5W6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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