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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ad6f6685c8904a80eb49b853842f897afe8b867217758b7d80266cb7e70918' 
  AND token = 'qH0b8hWBYU4ceOLaK7/PjnuJnNmxj3e+czi9g7SmASU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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