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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c757cf10c1c939d604efb2f1b84b6dc68a41578f3e1d4b981d477f46c5394ff0' 
  AND token = 'lFWX0gFpt67L9sV/dJqXKK2L3C3Psho65JJ9SH7/N/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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