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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3214335118b248700e768f8ea5cbc84597b51a470b33ea5b5d13efd73ac60dde' 
  AND token = '0Pb3t3CYA8gC7ac+fOfeUApE6w4gSecd/9eX9f1AAS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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