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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f76f0bb75f732e6964ccd73afa3e08f8de9288efb1e00b166f745a01ddee85' 
  AND token = 'fti77EKG+sa2rOl1wsYN/DnQ+H/zoJDE7Bkrlhvp9DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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