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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3e1c2353360508ed08306c103c4dd98e1913d2dd768ea78124ad1e0488a38a' 
  AND token = '9nut1Szd7Ea9VFO13sIIEXx+6SCNTF9x3uyIHbqoGHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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