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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77aa502e7a8944b94dd501bcf8f6bfaf8e10c8d2edd15654241071438d193c6' 
  AND token = 'LWlpFxvcjpaBOz+25RIHGra21g1GNe7zUssoorpxov0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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