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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421d46fe1aa3ceed69a7b2ec76a23991e0b26978c23ee3bbcf743c2f80890e2a' 
  AND token = 'IlbzsLGyls9HYAGhQOC7pj752BK00hSmAUKk6UkubtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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