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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8673f9e274ccec5c44f8fd73a1314741708162ba74120e970dd1b29b4e9049d' 
  AND token = 'eHWrLUb6DQk2Jb4EogFmCNlmZfXgOyZ6ZKzc3haH6Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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