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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc96ad26db4b96d5b1f4c623a9588d639c9d37883b67d7bff9a7e39a2bb89f2' 
  AND token = 'xQha3V7BI6d3eNN1c/ksZ09/Jxs2VRz4g2Qe50YukJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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