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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e022ca1c35576063afb3c1be899456b4948a765613671f3c9d9567d10d4f24' 
  AND token = '3XzUOB1mzdhLSi8eGSPX2f2pOvAINHeqQH99qe9921Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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