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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662362dede49b6f9f1ee87ee12d9b18ea8edbf763f1b64808d901a3d9ff165d7' 
  AND token = 'RZ3eIyr90Iis0R+O6L29L/dBG9EPgC/KZ0vwhgUOtz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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