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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6576cea283611019900b68932a46e3716f2210d23438c9fee241281889e9d16' 
  AND token = '0Spfcw+z6Ldkks0s2fXfKoXKvljeEmviTZhbvtF5R88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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