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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd71bcdc7ee32584c2c73a8758837e5b5b691645c0f293f0f83531fe3cba8d0b' 
  AND token = 'eaeR+Ysbz7iyyr6E/8bFP6BH/DyNrtKOodfvw/CartY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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