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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e903fbbc16e986ec3e0c33ea8e662450e6e647d6e4b2cbb24992326ea508c568' 
  AND token = '9AcLSq0F+kFjEe4BaFbZdfEizkL55YPafZ8PmWwRgFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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