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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e5d814bfb06a79b541d4c680191801ba7e925500991180dc5d171091c5bbae' 
  AND token = 'J86TRqklh2wgWq/eyzfG+qxBMNFCUWYmCeDu0wi5FbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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