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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd59af2161db1bcadf29e908f361c84349ed99d4906ed0ae375344b5bec882c6' 
  AND token = 'uIFTqoYqV8MHaiS4Xla8MCPw/0rMxh9YwLPUq8FYl3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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