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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fad8df8bc675ec5b60f161fb10de24a2e641bd9f0466b9c47bbcec7da2e25b9' 
  AND token = 'uUah8c6mKmbuc1PHYOYRQAXERX/J/dseJ7aMfFw0J/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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