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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fd57cfeee92a98dfb53f0e07c1377c5eae32ec1a7d8ece7fb44d21443b24b4' 
  AND token = 'DeAC6GBqhBaDAzQuY3gAz5ZME/dgiO38OIyZqWW1UjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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