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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a94a7fcdaf00015f50a4d3e299e86804e8cea1b54d9517d9e448b5b1939694' 
  AND token = 'mw97l88BpS7ov+y17y7PgiAq6xbivpanNWf4e81l8Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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