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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8570830a9c925c6516173ea2f68c0f5d5c01b2027e8111debe13801c80ce76bd' 
  AND token = 'B2fqtKAZna8PNQTLrNprd9ca/6fDniyhacJR3btUUXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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