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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b97565e5cdc80939c11f3f327c64002a0e88830c98c6289e79c6947b54fd8f' 
  AND token = 'Y3Mpf7SMWT3W1NJAzEiQ8XOo0VH/0Anro7Gd0LicJ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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