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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39389b1d1891e75b7c80cdd3b493be1414b9601b3d798c7cc5d3f815cf7e316a' 
  AND token = 'BOyzwfp5lomML/4q2Un3JxumxCONdiMAF2BGMAwnTjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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