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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e858f9e7464507ba3acc4b56c2a5e940d4515b9288dadf470d7c144f4f67504' 
  AND token = 'qA9rCaFpc+z7wBgqq+7H0BOVKx1zV3EaEUEEEyl8L+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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