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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd473074fd6b7a8cd49f258aaed4496cdc372b2a3d68f86ffdbb8b275904de1' 
  AND token = 'WhOCA91pOu5Uhuaa5fLzUWjQ0WaEkgLzIiadAiNbZug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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