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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a0732ef86cd2906b35e3155291c9feaedc0a2c606cfbd1402ed9fd7c946bd6' 
  AND token = 'suJXRGied0+Aloyd7CmC2QVnw04JLHx3YXMZeVQ7foY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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