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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fba79caf851c7540eb051b7a60e82ba4855b08535834056469f6c64d03341d' 
  AND token = 'lntVHyK0M0GWmM4bV9fSVsqWA0PpGJUhZ74RF1ZKTHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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