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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10183bbc1ee4a59736006aae9bc58d674671e5db1baf31608f9a1583a3d82f98' 
  AND token = 'K3+elJfCTlXCTKraxOyhFrbmuETkacJhdBu1ZEi3hh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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