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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe16ed8950edce6a52a431cdf09848b07c947caec09af4351caa007ac4bad07' 
  AND token = 'kxZZONYGdI591A/fm7poNYW/5GRgDWBuRrVIjOnhhzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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