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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30ae592c23c4f202dabcbaf0f5cfc76e568b378eafc793d38a25eacf47b3fda' 
  AND token = 'J4y1cY3/DC2N167zTYEU5nstYX8whAfT6Hm71Dr5OB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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