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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3d60a0fd617ace3ca8f7ba297116eedbbf082aa446e35686585138d987f160' 
  AND token = 'QlwcCZWpc9+jU8RIRlvNTsIAHKx2vk1dRNhTBNxusmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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