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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71614841bd5d3f0ea1dd6e4ab733e8cc810dd85509d9252db5f4f19c8ff5b52a' 
  AND token = '7xetWzyjrF5sf+vzoESRFzjGz/FIk1AUsfDFrNpl6O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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