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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e4293bdf0dc7fcda79a21b3e9bdbf8c01191fcba2a4c930f85fca44fe79788' 
  AND token = 'b5S7jql7dcpgDgRxybt2H/7Wa7qmhOMF4lEHYE8Icjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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