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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30105bf3d9bf97dbb94c8b338cacf94dffecece7673e12066a781ae0fdb0466' 
  AND token = 'UQPI6tKLXbs4/oGr+uPJVFjCo6k56Kjs3xeABffM8Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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