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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a07100ba40ae9f2ad6df8ce870b12e784dc2452a8f66760af90f4eca00fa08e' 
  AND token = 'u6Ol67N+8yaM/kLpwXonOEbFuatnhyzBJYV4v+grI2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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