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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be75b659e464cf395f9e0ef8836349e5835b1463aa54fc9736d914113bde14af' 
  AND token = 'Ymob6jvZzUOQpyBGJaLtp1cs7L/rhfA4ij71/8qWj1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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