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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b71e31bb0dacbe15df879e48b3c01f397fdf58f8175a483e319a86e35a233b' 
  AND token = '7FlbyYYem5dF+3xSeYc7CiaFoENiwZFlB4wiMMAyoiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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