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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bd5756634e698bd0d03bccc006c62629f5e1978b6f2351ffccbcebad1784be' 
  AND token = 'lLz907R0w1DQ6k1A3mv08fTJWqQwtKLNMhUTJ0JPwgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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