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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904630b9f836c7a283fb658290e4be5954d16512a4564d0c659c4d780439d468' 
  AND token = 'IS7BvpmAHt+hRnEjVwLcTc1ZfbeEirD/ARPcmi2mrUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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