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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf9cc39cad0f14f9a629cf9e4bc61721bfc48c296e7f11cf6d57988061457ca' 
  AND token = 'BrnS3sN8/nE21L2icCfHWLpkgT4i8iI4al6RzDvUPKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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