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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9dfb42745f94f87ab6e1135078b54285b823db210e1cca3bbcab74399c6956c' 
  AND token = 'aWng2xMBmlamvpI4GBxfty1O4eOUk765rSK79zLCDcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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