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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a78b504b77e403b7f5e3658930119a790f2f5f48e47388272fb3b6237c7e667' 
  AND token = 'H5pnzUrLdr+NRRcofvYBi/IE1a4onWgHtsC5AMV3+mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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