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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526730010c352c9275ec85e49b3cf1796eaf3f51596be7ff3f4d6a366bd08bf8' 
  AND token = 'i0+CCtAHc4oXdalr5M3arM6b6T5EO5dR6z03lKPGii4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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