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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96794622230122dbd0a68edbff085fe2941ba906104a884766aeeadd4716c4f2' 
  AND token = 'b49thSMcKAqBbhbrH7klpNkQdFjln1sPeIUOz+sRLhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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