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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76f370eac7fc1e7f17276581e5d3c5b77ae34c84c777ae0827e7b2ef93856d1' 
  AND token = 'zIVPtL1jf4GP8/yuRqZgvuNuPR49Yg2aZbERET+hYrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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