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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4b2aae5272f7b8ed19b5873366f8cfdfc8f8d5901a1559a542d09f5a55291b' 
  AND token = 'WHGHc4r8XrFohkv9Ghmmd9ldn2P0TGQ/PA2/8JVCuEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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