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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948786a7dd59a0b002faed2e98d7d5fb02cb998543bb54a9535a7fe90abff9bf' 
  AND token = 'sjJBks/z+t8JGic6disUJ8eZFAdCjQqczdAPU5ws84E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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