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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b9ebad338513854f81bde9ef825f0f5ce10b6d16c57ac0b0e2f7dcbb81ea24' 
  AND token = 'G2VhRzULBf1/iax+2ZA55jbApfRivESSI7quwvyy0ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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