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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbf49edec47230ff89b6e85cc6e4e6ac837ebf4c8b6ff035d6ba40df9592fff' 
  AND token = 'OIecVAlfAIFMdekUN2QF02B5edAcF3LkTOKXkJ4AJ54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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