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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a56dc35eaff94cb83d15eeeaacf7bb7fcb0d650203d63dd77353214f6852141' 
  AND token = '10emvXH+1pKMRdoSZuDMJTt+7ffpj2WAIsTuezzluQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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