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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37541ccfe50bdf973dc4603dff6c746c91fb34f1c6881216f4e645b4d151e23f' 
  AND token = 'HHLav6cSKDmxfOQHX9hnFt1ZjRu3T1Cw1A2LTOOeqEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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