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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7323cb2f41603134396a8ec90ef82ba4bcb97b38dff098deaeb6c34601c45441' 
  AND token = 'OSSA4iu1YGAcV4FHfsuO2d7AeYD6/XPKvNB0EZGFMFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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